Fix IE 10 active link background color

Remove the gray background color from active links in IE 10.

Fix gh-172
Normalize the `template` element display

The `template` element shipped in Firefox 22 and Chrome 26. Browsers
without HTML template support should at least hide the element.
README: change guidance and demphasise v1

* Recommend that normalize.css is used as library code (i.e., not
  modified).

* Add a note that v1 is no longer actively developed.
Add Component(1) install instructions
Fix incorrect closing tag in `test.html`
Add IE 10 to checkbox/radio normalization comments
Fix component.json

The Component(1) spec was updated to require a `repo` property.
Update CHANGELOG
v2.1.3
Update component.json to fit new specification

Please see 690f8abb to see the full description in v2.
Mention that v1 is no longer maintained
v1.1.3
Merge normalize.css' v1 (version 1.1.3) into normalize.scss' master.
Merge normalize.css' master (version 2.1.3) into normalize.scss' master.
Update bower.json.
Update installation instructions in README.md.
Add license to gemspec.
Update version number to 2.1.3.